ActiveMQ as the instance message broker
Apache ActiveMQ is an open source message-oriented middleware (MOM). ActiveMQ serves as a middleman between distributed applications and operates in an asynchronous manner. It acts like a post office for messages wherein the delivery of messages is accounted for, managed, directed, and guaranteed to be delivered. ActiveMQ can be used to manage the exchange of messages between applications or micro-services and is the default messaging broker used by Martini.
Check these guides on how to configure your ActiveMQ broker: